<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
    <script>
        var a = [];
        for (var i = 0; i < 10; i++) {
            a[i] = function () {
                console.log(i);
            }
        }

        a[6]();
    </script>

</body>
</html>